Seahorse

Let's take a look!

What type of experiment is this?

Experimental procedure and explanation:

• We apply the floater and use a bendable straw to make a seahorse.
• We then bend the straw at the neck, bend the tip and secure it with cellotape to make a mouth. We block the end firmly to prevent air leakage.
• Attach a nut or any other weight. The tail is folded thin at the tip (this can be easily made by wrapping a piece of cellophane tape around it) and then rolled up to make a spiral shape. We drill a small hole around the bottom of the nut (this is where water enters and exits).
• The body is made of a thin sheet of wood or other material and attached to a straw. The seahorse is now complete.
• We float this in water and adjust the amount of air in the straw to ensure that the head floats slightly.
• This is placed inside a plastic bottle filled with water and the cap is placed on it .
• The seahorse sinks when you grip the plastic bottle tightly and floats up when you loosen your grip.
• This experimental video was produced with the support of JSPS Grant-in-Aid for Scientific Research 18K03956.

[Keywords]	Buoyancy, Cartesian diver
[Related items]	Garden Eel, Cartesian diver
[Reference]	Ryozo Ishiwata, "The Wonder of Flow," Kodansha Blue Backs, p. 42-47.

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